JP2024016294A - Communication control device, mobile object, base station, and communication control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication control device, a mobile object, a base station, and a communication control method that suppress deterioration in communication quality.

SOLUTION: A communications system includes a communication device 10 provided in each of a plurality of mobile bodies M, a plurality of base stations 20, a communication control device 30, and server (receiving device), and the communication control device includes a prediction unit that predicts communication quality between a third communication device and a second communication device on the basis of environmental information of a first communication device, communication quality information between the first communication device (communication device 10) and a second communication device (base station 20), and environmental information of a third communication device (communication device 10), and a redundancy control unit that makes data transmitted from at least one of the third communication device and the second communication device redundant on the basis of the predicted communication quality.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present disclosure relates to a communication control device, a mobile object, a base station, and a communication control method.

As communication systems become more widespread and faster, it is expected that they will be applied to mission-critical fields such as autonomous driving, remote control of robots, and remote medical care. Mission-critical fields require highly reliable data communication technology. Especially in the communication of mobile devices such as autonomous driving and remote control of robots, the quality of communication changes from moment to moment, so there is an urgent need to improve reliability.

Technologies to improve reliability in wireless communications include automatic retransmission control in the radio section called Automatic Repeat Request (ARQ), error correction technology called Forward Error Correction (FEC), and Hybrid ARQ (HARQ), which is a combination of these. It has been known. FEC is widely used in real-time communications where delays due to retransmission cannot be tolerated, but if the redundancy rate for error correction is set too high, communication bandwidth is used redundantly, making it inefficient.

As a technology that uses FEC for congestion control, there is a technology that estimates the available bandwidth and changes the FEC redundancy rate. There is also a technology that estimates the communication error rate from past communication conditions and determines the redundancy rate.

The above-described technology determines the redundancy rate by estimating the error rate from the history of bandwidth or communication quality in one-to-one communication between fixed terminals. However, in mobile communication, unlike communication between fixed terminals, it is difficult to estimate future communication status from the past communication status of the own terminal. In particular, when the mobile location is moved to a location with a different base station, frequency band, or radio wave environment, the communication status of the own terminal is significantly different from before the movement, so the communication status before the movement cannot be used for estimation.

Japanese Patent Application Publication No. 2009-159368 Japanese Patent Application Publication No. 2006-109325 Special Publication No. 2008-522545

M. Nagy et al., “Congestion Control using FEC for Conversational Multimedia Communication,” ACM MMSys’14, 2014

The present disclosure provides a communication control device, a mobile object, a base station, and a communication control method that suppress deterioration in communication quality.

The communication control device of the present embodiment is configured to control the third communication device based on the environment information of the first communication device, the communication quality information between the first communication device and the second communication device, and the environment information of the third communication device. a prediction unit that predicts communication quality between the device and the second communication device; and control that makes data transmitted from at least one of the third communication device or the second communication device redundant based on the predicted communication quality. It is equipped with a section and a section.

FIG. 1 is a block diagram of a communication system according to a first embodiment. FIG. 2 is a block diagram of a mobile communication device, a base station, and a communication control device. A diagram showing an example of an environmental database. The figure which shows an example of a communication quality database. FIG. 3 is a diagram showing how a mobile body switches its connection destination to another base station due to handover. The figure which showed the example which makes the data transmitted from a mobile object redundant. FIG. 2 is a diagram showing an example of an operation sequence of the communication system according to the present embodiment. 2 is a flowchart of an example of an operation in which a communication control device generates a predictive model. 2 is a flowchart of an example of an operation in which a communication control device predicts communication quality of a mobile object at a future time and makes data redundant. FIG. 7 is a block diagram of an example of a communication system according to modification 6. FIG. 2 is a block diagram showing an example of a communication system according to a second embodiment. FIG. 2 is a block diagram showing an example of the hardware configuration of each device in each embodiment.

Embodiments of the present disclosure will be described below with reference to the drawings. The drawings schematically illustrate embodiments of the present disclosure as an example, and the embodiments of the present disclosure are not limited to the forms disclosed in the drawings. In the plurality of figures, the same elements are given the same reference numerals, and explanations of already explained elements are omitted as appropriate.

(First embodiment)
FIG. 1 is a block diagram of a communication system according to a first embodiment. The communication system in FIG. 1 includes communication devices 10 provided in a plurality of mobile bodies M, a plurality of base stations 20, a communication control device 30, and a server (receiving device) 40. The mobile object M or the communication device 10 is equipped with one or more antennas 11 . The base station 20 is equipped with one or more antennas 21. Communication control device 30 includes one or more antennas 31. The server 40 may include an antenna.

The moving object M is any moving object such as a vehicle, a ship, a flying object (such as an airplane or a drone), an elevator, and a mobile terminal (smartphone, tablet terminal, notebook PC, etc.). Examples of vehicles include cars, robots, trains, etc. In this embodiment, it is assumed that the mobile object M is a car. The vehicle may be either a vehicle that has a function to assist the user in driving, or a self-driving vehicle that autonomously makes decisions and drives.

The communication device 10 of the mobile body M is wirelessly connected to at least one base station 20 via a communication network. The communication network is, for example, a mobile network or a wireless network such as a wireless LAN (Local Area Network). Examples of mobile networks include 3G networks, LTE networks, and next generation (5G) networks, but any type of network may be used. The communication network may include multiple types of networks. In this case, the communication device 10 of the mobile body M may select a network to be used for communication from a plurality of types of networks. Furthermore, it is not excluded that the communication network is a wired network.

The communication device 10 of the mobile body M transmits data, for example, a packet containing the data, to the base station 20. Note that a packet is a general expression of a unit of information transmission, and is not limited to a unit of information transmission of a specific protocol, and may be replaced with other terms such as frame, datagram, or segment. The destination device of data transmitted by the communication device 10 is the base station 20, the communication device 10 of another mobile body M, or the server 40. The server 40 is a communication device (receiving device) that collects data. The server 40 is connected to the base station 20 via a wired or wireless communication network 50. If the destination device of the data is other than the base station 20, that is, if the address of the destination device is different from the address of the base station 20, the base station 20 transfers the data according to the address of the destination device.

The communication device 10 of the mobile body M may transmit data to the base station 20 as well as receive data from the base station 20. When the communication device 10 receives data from the base station 20, the data transmission source (generation source) may be the base station 20 or another communication device (the communication device 10 of another mobile body M, the server 40, etc.). But that's fine. In the following description, when the communication device 10 provided on the mobile body M connects or communicates, it may be referred to as the mobile body M connects or communicates. In this embodiment, for the purpose of collecting information from the mobile body M, the mobile body M or the communication device 10 is used as a transmitting device that transmits data for collecting information, and a base station 20 or server 40 as a receiving device that receives the data. The explanation will focus on the form in which this is done. However, this embodiment is not limited to this form. For example, when the base station 20 or server 40 transmits update data to the mobile body for software update or map (for example, high-definition map) update in the mobile body M, the base station 20 or the server 40 It is also possible to use the transmitter, mobile M, or communication device 10 that transmits data as a data receiver. In this case, the role of the mobile body M as a transmitter and the role of the base station 20 or server 40 as a receiver in the following description may be interchanged.

The mobile body M is wirelessly connected to the communication control device 30 via a communication network. A specific example of the communication network is the same as that of the base station 20. The communication network through which the mobile body M is connected to the communication control device 30 may be the same as or different from the communication network through which the mobile body M is connected to the base station 20. In addition to communicating directly with the communication control device 30, the mobile body M may communicate with the communication control device 30 via the base station 20.

The base station 20 wirelessly connects to the communication device 10 provided in the mobile body M by performing a predetermined connection process with the communication device 10 . The base station 20 communicates with the connected communication device 10. The base station 20 is an example of a relay device that relays data. The base station 20 receives data from the communication device 10 or another communication device, and processes the received data if the destination device of the received data is the base station. When the destination device of the received data is other than the base station 20, the base station 20 transfers the received data to the destination device.

The base station 20 is connected to other base stations 20 via a backbone network. The backbone network may be a wired network or a wireless network.

The base station 20 performs processing related to handover in which the base station to which the mobile body M connects is switched from its own base station to another base station, depending on the radio wave condition (for example, radio field strength, etc.) of the connection with the mobile body M. For example, the base station 20 determines the base station to which the mobile body M should switch based on the position information of the mobile body M and the like. The base station 20 performs a handover procedure between the determined base station and the mobile body M, thereby switching the connection destination of the mobile body M to another base station so as not to interrupt the communication of the mobile body M.

The communication control device 30 performs control to make data transmitted from the mobile body M to the base station 20 or data transmitted from the base station 20 to the mobile body M redundant. For example, if the radio wave conditions between the base station 20 and the mobile unit M are expected to be low in the future, the communication control device 30 can perform data redundancy in advance, so that if the radio wave conditions worsen, It also suppresses deterioration in communication quality. Examples of situations in which the radio wave condition is predicted to be low in the future include cases where a handover is expected, or cases where a mobile object M traveling on an expressway is expected to travel in an environment with poor radio wave conditions, such as a tunnel, in the future. There is.

An example of control regarding redundancy is changing the redundancy level (redundancy rate) of data to be transmitted. Examples of changing the redundancy include changing the number of times the same data is transmitted, or changing the coding rate when data is encoded (for example, erasure correction coding). Further, other examples of control regarding redundancy include changing the time interval for transmitting data, changing the number of transmission systems used for data transmission, etc. Details of control regarding redundancy will be described later.

FIG. 2 is a block diagram of the communication device 10, base station (communication device) 20, and communication control device 30 of the mobile body M.

[Communication device 10 of mobile body M]
The communication device 10 of the mobile body M includes a transmission buffer section 101, a redundancy section 102, a communication section 103, an environmental information acquisition section 104, a communication section 105, and one or more antennas 11 (see FIG. 1). The transmission buffer unit 101 is connected to a sensor device 12 provided on the mobile body M. Sensor device 12 includes one or more sensors. The communication device 10 corresponds to the first communication device and the third communication device according to the present embodiment, as an example.
(Second communication device)

Examples of sensors include cameras, GPS, sensors that detect vehicle driving information (LiDAR (Light Detecting And Ranging), speed sensors, acceleration sensors, etc.), and detection of vehicle control information (engine rotation status, accelerator pedal depression status, etc.) sensors, sudden braking detection sensors, obstacle (falling objects, vehicles in front) detection sensors, etc. The sensor may output data at regular intervals in chronological order, or may output data at specific timing, such as when an event occurs. Examples of sensors are not limited to those mentioned above. For example, the sensor may detect data input from a user such as a passenger of a car via an operation unit.

The transmission buffer unit 101 acquires data detected by the sensor and stores the acquired data in an internal storage area. The data detected by the sensor includes, for example, sensor attribute information, detection time, and data itself. The transmission buffer unit 101 manages the order in which data is acquired, and outputs the data in the order in which it is received. The transmission buffer unit 101 is a storage device having a storage area of a predetermined size, and is configured by, for example, a recording medium such as a memory or a hard disk.

The environmental information acquisition unit 104 acquires the environmental information of the mobile body M, for example, at fixed time intervals or at the timing when a specific event occurs. Environmental information is information that correlates with the communication quality of a mobile object. Examples of environmental information include information specifying the position of the mobile object M, information specifying the current time, information regarding the radio wave status with the connected base station 20, weather information, road traffic information, and the mobile object M. There is operation information, etc. Examples of information that identifies the location of the mobile object M include the latitude and longitude determined by the GPS (Global Positioning System) installed in the mobile object M, information on the road on which the mobile object M is traveling, and the kilometer post installed on the road. , road lane information, etc. Examples of information regarding the radio wave conditions with the base station 20 include information such as the intensity of the radio waves from the base station 20, the direction of the radio waves, and the frequency band of the radio waves used for communication. Examples of weather information include weather (sunny, rainy, snowy, typhoon, etc.), temperature, humidity, cloud position, etc. For example, radio wave propagation characteristics change depending on the humidity and clouds in the sky. Weather information could also be applied to satellite communications and stratospheric communications. An example of road traffic information is information such as traffic congestion or congestion. When there are many cars around, such as in traffic jams, the probability of communication collision increases. Examples of the motion information include information on motions such as steering, accelerator, speed, etc., or a history (log) of motions of a moving body. For example, as the speed of the moving object increases, the packet loss increases. The environment or road on which the mobile object is traveling may be estimated from the movement history.

The communication unit 105 communicates with the communication unit 305 of the communication control device 30. The communication unit 105 transmits the environmental information acquired by the environmental information acquisition unit 104 to the communication unit 305 of the communication control device 30. Further, the communication unit 105 receives from the communication unit 305 of the communication control device 30 information (redundancy instruction information) instructing a method for making data transmitted from the mobile communication device 10 redundant.

Redundancy section 102 reads data to be transmitted from transmission buffer section 101 . Data is read out at a rate depending on the time constraints of the application to which the data is provided, for example. Examples of applications include applications that generate high-definition maps, applications that generate engine control optimization models, applications that generate road safety information, and the like. As an example, in applications that generate high-definition maps and applications that generate engine control optimization models, the time constraints for data transmission are long (one hour, one day, etc.). On the other hand, in applications that generate road safety information, the time constraints for data transmission are short (for example, 10 seconds or less). As an example, data with short time constraints corresponds to data with high priority, and data with long time constraints corresponds to data with low priority.

The redundancy section 102 makes the read data redundant according to the redundancy instruction information. As an example of redundancy, data is duplicated here with the degree of redundancy indicated by the redundancy instruction information. For example, the degree of redundancy is defined as the ratio of the number of transmitted data (number of transmitted packets) after redundancy to the number of transmitted data (number of transmitted packets) before redundancy. In this case, if the redundancy is 2, each piece of read data is transmitted twice, and if the redundancy is 1.5, the same data is transmitted twice at a rate of one in two. If any one of the data transmitted multiple times is correctly received on the receiving side, there is no problem even if the remaining data is lost. Therefore, by providing redundancy, deterioration in communication quality can be suppressed.

The communication unit 103 communicates with the communication unit 201 of the base station 20. The communication unit 103 includes a transmission system that transmits data made redundant by the redundancy unit 102 to the communication unit 201 of the base station 20. For example, the communication unit 103 processes various communication protocols (eg, physical layer, data link layer, IP layer, transport layer, etc.) and generates packets. The communication unit 103 modulates and DA converts the packet into an analog signal, and extracts a signal in a desired band from the analog signal. The communication unit 103 up-converts the extracted signal to a radio frequency, and amplifies the radio frequency signal with an amplifier. The communication unit 103 transmits the amplified radio frequency signal via the antenna 11. The communication unit 103 may perform erasure correction coding on the data to be transmitted, or may perform coding using an error correction code other than the erasure correction code. The protocol layer for encoding may be any of the physical layer, data link layer, IP layer, transport layer, application layer, etc. When using a uniquely defined communication protocol, encoding may be performed at the layer of the communication protocol.

Examples of erasure correction codes include RS codes, rateless codes, BCH codes, fountain codes, Tornado codes, LT (Luby Transform) codes, Raptor codes, RaptorQ codes, Zigzag decodable codes, ZD fountain codes, or XOR codes. Examples of error correction codes other than erasure correction codes include convolutional codes, turbo codes, LDPC codes, Polar codes, and the like.

As another example of making data redundant, the coding rate of the erasure correction code may be changed. For example, by lowering the coding rate, the number of redundant packets (or parity packets) to be generated is increased. If a predetermined number of redundant packets or more corresponding to the coding rate among the generated redundant packets reach the receiving side, the receiving side can correctly decode the data, so redundancy can suppress deterioration in communication quality.

Further, as another example of data redundancy, the communication unit 103 is provided with a plurality of transmission systems (for example, transmission system 1 and transmission system 2), and the redundancy unit 102 transfers the plurality of data to be transmitted to transmission system 1 and transmission system 2. It may be dispersed by At this time, each transmission system may use a different communication system, such as transmission system 1 using a mobile line and transmission system 2 using a communication system different from the mobile line, for example, using a wireless LAN. In this case, on the base station 20 side as well, it is necessary to equip the communication section 201 with a plurality of reception systems corresponding to the plurality of transmission systems. By transmitting data in a distributed manner over multiple transmission systems, even when data (packet) loss occurs in bursts, the number of lost packets can be suppressed.

Further, as another example of data redundancy, the redundancy unit 102 may change the transmission interval (transmission rate) at which the communication unit 103 transmits data. For example, by reducing the data transmission interval, it is possible to increase the probability of successful data transmission when the radio wave condition with the base station 20 is poor.

[Base station 20]
In FIG. 2, the base station 20 includes a communication section 201, a relay determination section 202, a communication section 203, a reconfiguration section 205, a reception buffer section 206, a data processing section 207, a communication quality measurement section 208, and a communication section 209. . A receiving device including the reconfiguring section 205, the receiving buffer section 206, and the data processing section 207 may be provided as a single device outside the base station 20 and connected to the base station 20 by wire or wirelessly. The base station 20 corresponds to the second communication device according to the present embodiment, as an example.

The communication unit 201 communicates with the communication unit 103 of the mobile body M. As an example, the communication unit 201 receives data (packets) transmitted from the communication unit 103 of the mobile body M. The communication unit 201 performs, for example, physical layer and data link layer processing of received packets.

The relay determining unit 202 determines whether the destination device is the own base station 20 based on the header (for example, IP header) of the processed packet, and if the destination device is the own base station 20, the relay determining unit 202 transmits the received packet to the reconfiguring unit. Pass it to 205. If it is not the own base station 20, the relay destination of the packet is determined based on the header of the packet. The communication unit 203 generates and adds a packet header (for example, a data link layer header and a physical layer header) based on the determined relay destination, and transmits the packet. The relay destination of the packet is, for example, another mobile body M, another base station, the server (receiving device) 40, or the like.

The reconstruction unit 205 restores data from the packet passed from the relay determination unit 202 and provides the restored data to the reception buffer unit 206. When the same data is received multiple times due to redundancy, only one of the multiple pieces of the same data is provided to the reception buffer unit 206. When an erasure correction coded packet is received, the packet is decoded using a decoding method corresponding to the erasure correction code used, and the decoded data is provided to the reception buffer unit 206. If data acquisition or restoration fails, the reconfiguration unit 205 may transmit a packet retransmission request to the mobile body M via the communication unit 201.

The reception buffer section 206 buffers the data provided from the reconfiguration section 205. The reception buffer section 206 outputs the buffered data to the data processing section 207 in the order in which it is received. The reception buffer section 206 is a storage device having a storage area of a predetermined size. The reception buffer unit 206 is configured, for example, by a recording medium such as a memory or a hard disk.

The data processing unit 207 processes the data provided from the reception buffer unit 206. The data processing unit 207 includes, for example, an application and a CPU, and the CPU executes the application. Examples of applications include generation of high-definition maps, generation of optimization models for engine control, and generation of road safety information, but these are just examples; there are many other applications. For example, it may be an application that collects and stores data.

Communication quality measurement section 208 measures communication quality based on communication between communication section 201 and communication section 103 of mobile body M. As an example, the loss rate of packets received from the mobile body M (packet loss rate) or the loss rate of data received from the mobile body M (data loss rate) may be measured. As an example, the communication quality measurement unit 208 measures the packet loss rate at the data link layer or the like. Alternatively, the radio field strength (for example, RSSI: Received Signal Strength Indicator) of the signal received from the mobile body M by the communication unit 201 may be measured. The communication quality may be measured at regular intervals, each time a packet is received, or at other timings.

The communication unit 209 communicates with the communication unit 304 of the communication control device 30. The communication unit 209 transmits information representing the communication quality measured by the communication quality measurement unit 208 (communication quality information) to the communication unit 304 of the communication control device 30 . As an example, the communication unit 209 transmits the communication quality information to the communication unit 304 in association with the identification information of the mobile body M, the identification information of the own base station 20, and the measurement time (time stamp). The measurement time may be the time when the communication quality was actually measured, or the time when the packet (or data) used to measure the communication quality was received. Alternatively, if the packet received from the mobile object M includes information such as the transmission time of the packet, the communication unit 209 may use the transmission time and the like as the measurement time.

If the destination device of the data transmitted from the mobile body M is another device such as the server 40, the reconfiguration unit 205, reception buffer unit 206, and data processing unit 207 shown in FIG. 2 also include the other device, Perform the same action.

[Communication control device 30]
The communication control device 30 includes an information acquisition section 301, a prediction section 302, a redundancy control section (control section) 303, a communication section 304, a communication section 305, and a model storage section 306. In the example of FIG. 2, the communication control device 30 is a device separate from the base station 20 and the communication device 10, but the communication device 30 may be included in the base station 20 or the communication device 10.

The communication unit 304 communicates with the communication unit 209 of the base station 20. For example, the communication unit 305 receives communication quality information from the communication unit 209 of the base station 20, and provides the communication quality information to the information acquisition unit 301.

The communication unit 305 communicates with the communication unit 105 of the communication device 10 in the mobile body M. As an example, the communication unit 305 receives environmental information from the communication unit 105 of the communication device 10 in the mobile body M (first mobile body), and provides the received environmental information to the information acquisition unit 301. The communication unit 305 also transmits the redundancy instruction information generated by the redundancy control unit 303 to the communication unit 105 of the communication device 10 in the mobile body M.

The information acquisition unit 301 maintains an environment database that stores environment information and a communication quality database that stores communication quality information. The information acquisition unit 301 stores environmental information provided from the communication unit 305 in an environment database, and stores communication quality information provided from the communication unit 209 in the communication quality database. The communication quality database stores the history of communication quality of communication between base stations and mobile units. The environmental database stores the history of environmental information of the mobile body (the history of the environmental information of the communication device 10 provided in the mobile body).

FIG. 3 shows an example of an environment database. The ID of the mobile body M, the time when the environmental information was acquired, and the environmental information are stored. In the example of FIG. 3, location information specified by longitude and latitude is stored as environmental information. As described above, the environmental information may be information on the road on which the mobile object M is traveling, kilometer posts provided on the road, lane information on the road, or the like.

FIG. 4 shows an example of a communication quality database. The base station ID, mobile ID, communication quality measurement time, and communication quality information are stored. In the example of FIG. 4, a mobile object with an ID of M001 (mobile object M001) is communicating with a base station with an ID of B031 (base station B031), and due to a handover, the connected base station is changed to the base station B031. An example is shown when switching to .

The prediction unit 302 generates a model (prediction model) that predicts communication quality from environmental information based on the environmental information database and the communication quality database (learning phase). For example, a model that predicts the communication quality at time t1+Δt (t1+Δt is a future time after tn) is generated from environmental information from time t1 to tn (n is an integer of 2 or more). As a model, a regression model that regresses communication quality at a future time from environmental information at a past time can be used. Examples of regression models include neural networks, multiple regression models, and regression trees (decision trees). The prediction unit 302 includes a model generation unit that generates a communication quality prediction model based on environmental information. After the prediction unit 302 generates the prediction model, it may update the prediction model periodically or at any timing based on the newly acquired environmental information and communication quality information (update phase).

The model storage unit 306 stores the prediction model generated or updated by the prediction unit 302. The model storage unit 306 is a storage device having a storage area of a predetermined size, and is configured by, for example, a recording medium such as a memory or a hard disk.

The prediction unit 302 acquires environmental information from the communication device 10 (third communication device) in the mobile body M (second mobile body) that is subject to redundancy control. The prediction unit 302 predicts the communication quality of the mobile body M based on the acquired environmental information of the mobile body M and the prediction model (prediction phase). For example, the prediction unit 302 acquires environmental information at predetermined time intervals and predicts the communication quality of the mobile body M after a certain period of time from each acquisition.

When the prediction phase and the update phase are performed simultaneously, the environment information of the mobile body M is transmitted to the information acquisition unit 301 for generating or updating a prediction model, and also for predicting the communication quality of the mobile body M. It may also be transmitted to the prediction unit 302. When the prediction phase is performed and the update phase is not performed, the environment information of the mobile body M is transmitted to the prediction unit 302 and does not need to be transmitted to the information acquisition unit 301. Furthermore, when sampling a mobile body M from which environmental information used for generating a prediction model is to be acquired among the plurality of mobile bodies M, it is not necessary to acquire environmental information from mobile bodies M that are not subject to sampling.

The redundancy control unit 303 is a control unit that performs control to make data transmitted from the mobile body M redundant based on a predicted value of the communication quality of the mobile body M. The redundancy control unit 303 increases the degree of redundancy as the communication quality decreases. For example, if the communication quality is the packet loss rate, the redundancy of data (or packets) is increased if the predicted value of the communication quality exceeds a threshold, or if the state above the threshold continues for a certain period of time. . If it becomes less than the threshold value or if the state of being less than the threshold value continues for a certain period of time or more, the data redundancy is returned to the initial value (for example, a value without redundancy or a value with low redundancy). The degree of redundancy is determined in advance in association with a threshold value. A plurality of threshold values may be provided and the redundancy may be changed in stages. Alternatively, when the predicted value of communication quality exceeds a threshold value, the redundancy level may be increased at a constant slope, and after a certain period of time has elapsed or the redundancy level has reached a predetermined value, the redundancy level may be kept constant. When the predicted value of communication quality becomes less than a threshold value, the redundancy level may be lowered at a constant slope, and when it reaches the initial value, the redundancy level may be fixed at the initial value. Furthermore, a statistical value such as a moving average of predicted values of communication quality may be used for comparison with the threshold.

The redundancy control unit 303 generates redundancy instruction information that instructs the mobile body M to perform redundancy, and transmits the redundancy instruction information to the mobile body M via the communication unit 305. For example, it instructs to increase the redundancy to a certain value, to decrease the redundancy to a certain value, or to return the redundancy to its initial value. The redundancy section 102 of the communication device 10 in the mobile body M receives the redundancy instruction information via the communication section 105, and makes the data to be transmitted redundant based on the redundancy instruction information.

In this way, the redundancy control unit 303 makes the data transmitted from the mobile body M redundant at the stage when the predicted value of the communication quality becomes low (before the communication quality of the mobile body M actually deteriorates). Thereby, even if the radio wave environment of the mobile body M becomes poor, the success rate of data transmission can be increased. A specific example will be described using FIGS. 5 and 6.

FIG. 5 shows a state in which a mobile object M travels while communicating with the base station 20_1, and switches the connection destination to the base station 20_2 by handover midway. The mobile body M transmits, for example, data captured by a camera to the receiving device 40 via a connected base station.

FIG. 6 shows an example in which the communication control device 30 predicts communication quality based on the environment information of the mobile body M and makes data redundant for the mobile body M in the case of FIG. Since the predicted value of the packet loss rate from time 0 to time t12 is greater than or equal to threshold A and less than threshold B, the redundancy is set to the first value higher than the initial value. At this time, the number of packets including redundant packets is increased compared to the initial state without redundancy (the packet transmission rate is higher than the initial predetermined rate), and the bandwidth is lower than the initial state. It has increased from BW0 to BW1. At this time, the mobile body M is approaching the edge of the area of the base station 20_1, for example. At time t11, it is predicted that the predicted value of packet loss after time t12, which is a certain period of time after time t11, will be equal to or greater than the threshold (threshold B). For example, it is predicted that handover will occur near time t12. For this reason, the redundancy is increased at a constant slope from time t11 to the second value. This further increases the packet transmission rate, and the bandwidth after the increase becomes BW2. Thereafter, at time t13, it is predicted that the predicted value of packet loss after time t14, which is a certain period of time after time t13, will be less than the threshold (threshold A). For example, it is predicted that the radio wave condition of the mobile body M will become stable after time t14 due to handover. Therefore, the redundancy is decreased at a constant slope from time t14 to the initial value. In the example of FIG. 6, the redundancy is increased or decreased at a constant slope, but the redundancy may be changed all at once to a desired value.

In this way, in this embodiment, redundancy is not performed after communication quality becomes low, but redundancy is performed when the predicted value of communication quality becomes low. Thereby, even if the radio wave environment actually deteriorates, deterioration in communication quality can be suppressed. Furthermore, even if the frequency band used is changed due to handover, deterioration in communication quality can be suppressed. Note that redundancy increases the bandwidth used for communication, so the usable bandwidth decreases accordingly. Furthermore, the processing load for redundancy of the mobile body M becomes heavy. Therefore, it is preferable that the degree of redundancy is appropriately determined according to the predicted value of the communication quality of the mobile body M.

FIG. 7 shows an example of an operation sequence of the communication system according to this embodiment. The example in FIG. 7 shows an operation sequence when the communication control device 30 is included in the base station 20. Mobile body M starts communication (fixed band communication) with receiving device 40 via base station 20 (S101). For example, data captured by a camera is provided to an application running on the receiving device 40 at a constant rate. When the base station 20 predicts that the quality of communication with the mobile object M will deteriorate (for example, the packet loss rate will exceed a threshold value), the base station 20 transmits redundancy instruction information to increase the redundancy of the data of the mobile object M. The information is transmitted to the mobile body M (S102). The mobile M increases the redundancy of the packet to be transmitted according to the redundancy instruction information, and generates and transmits the packet with the increased redundancy (S103). When the base station 20 predicts that the communication quality of communication with the mobile object M will increase (for example, the packet loss rate will become less than a threshold value), the base station 20 transmits redundancy instruction information to reduce the redundancy of the data of the mobile object M. The information is transmitted to the mobile body M (S104). The base station 20 in step S104 may be the same base station as the base station 20 in step S102, or may be the base station after handover when mobile M has performed handover. The mobile M reduces the redundancy of the data to be transmitted according to the redundancy instruction information, and generates and transmits a packet with the reduced redundancy (S105).

FIG. 8 is a flowchart of an example of an operation in which the communication control device 30 generates a prediction model. The information acquisition unit 301 of the communication control device 30 acquires the history of environmental information of the mobile body M and the history of communication quality information between the mobile body M and the base station 20 (S111). Specifically, environmental information acquired from the mobile object M is stored in an environmental database, and communication quality information measured with the mobile object M is stored in the communication quality database. The prediction unit 302 generates a prediction model that predicts communication quality at a time after a certain period from environmental information in a certain period, based on the environment database and the communication quality database (S112). For example, a regression model is generated that regresses the communication quality at a time after the period (future time) from the environmental information at each time within a certain period. The prediction unit 302 stores the prediction model in the model storage unit 306.

FIG. 9 is a flowchart of an example of a control operation in which the communication control device 30 predicts the communication quality of the mobile body M at a future time and makes data transmitted by the mobile body M redundant. The prediction unit 302 of the communication control device 30 acquires environmental information from the mobile object M (S121). The prediction unit 302 predicts the communication quality of the mobile body M in the second period after the first period from the environmental information in the first period and the prediction model in the model storage unit 306 (S122). The first period and the second period each include at least one time. The redundancy control unit 303 generates redundancy instruction information for making data transmitted by the mobile body redundant based on the predicted value of communication quality, and transmits the redundancy instruction information to the mobile body M (S123). The mobile M makes the data transmitted to the base station 20 redundant (for example, increases or decreases the degree of redundancy) according to the redundancy instruction information.

As described above, according to the present embodiment, a prediction model that predicts future communication quality from past environmental information is generated based on the environmental information and communication quality information of one or more preceding vehicles. The future communication quality of the following vehicle is predicted from the generated prediction model and the following vehicle's environmental information. Based on the predicted communication quality, the data communicated by the following vehicle is made redundant. As a result, even if the radio wave environment of the following vehicle actually deteriorates, the data is redundant, so it is possible to prevent the communication quality from deteriorating.

(Modification 1)
Although the first embodiment describes an example in which the data transmitted from the mobile body M to the base station 20 is made redundant, the data transmitted from the base station 20 to the mobile body M may be made redundant. In this case, the base station 20 may be provided with a redundancy section, and the communication control device 30 may transmit redundancy instruction information to the base station 20. Further, both the data transmitted from the mobile body M to the base station 20 and the data transmitted from the base station 20 to the mobile body M may be made redundant.

(Modification 2)
In the first embodiment, the communication quality between the mobile body M and the base station 20 is measured by the base station 20, but the mobile body M may also measure the communication quality between the mobile body M and the base station 20. In this case, a communication quality measuring section may be provided in the communication device 10 of the mobile body M, and communication quality information measured by the mobile body M may be transmitted to the communication control device 30.

(Modification 3)
In the first embodiment, an example was shown in which the communication control device 30 instructs the redundancy level to the mobile body M, but if the mobile body M side knows in advance the redundancy level after the change, redundancy can be started. Alternatively, the termination instruction may be transmitted as redundancy instruction information.

(Modification 4)
When data is made redundant by encoding with erasure correction coding, the redundant packets (redundant data) generated by encoding are delayed from the transmission of normal packets (packets other than redundant packets). It may be sent at any time. Specifically, the redundant packet may be transmitted at a timing shifted from the timing at which communication quality is predicted to be degraded. That is, the timing of transmitting redundant data is adjusted based on the predicted communication quality. As a result, when the connected base station is switched due to handover, etc., there is a possibility that packets may be lost in bunches during the switching, but data can be restored by delaying the transmission of redundant packets. You can increase your chances of doing so.

(Modification 5)
In the first embodiment, the communication control device 30 is a device independent of the mobile body M or the base station 20, but as described above, the communication control device 30 is provided inside the mobile body M or the base station 20. You can leave it there. When the communication control device 30 is provided in the mobile body M, the exchange between the communication unit 105 and the communication unit 305 can be replaced by information transmission within the same device. When the communication control device 30 is provided in the base station 20, the exchange between the communication unit 209 and the communication unit 304 can be replaced by information transmission within the same device.

(Modification 6)
In the first embodiment, an example has been described in which the mobile body M is a car and the communication device 10 is provided in the car, but in the sixth modification, the mobile body is a mobile terminal, a tablet device held by a user, , a notebook PC, a smartphone, and other user terminals are shown as examples. In this case, the communication device 10 is provided in a user terminal.

FIG. 10 is a block diagram of an example of a communication system according to modification 6. The floor plan of the user's home is shown in a two-dimensional manner. An access point (AP) 26 is placed in the living room. A user at home holds a user terminal 16. The AP 26 constitutes a wireless LAN and communicates with the user terminal 16 wirelessly. Further, the AP 26 is connected to a communication network 50 such as the Internet. The AP 26 has the same functions as the base station (communication device) 20 in FIG. The user terminal 16 can communicate with the server (receiving device) 40 on the communication network 50 using the AP 26 as a relay device. The user terminal 16 can communicate with the communication control device 30 via the AP 26 or via another line. Communication control device 30 is placed in communication network 50 . The communication control device 30 may be provided within the user terminal 16 or the AP 26.

The communication control device 30 generates a predictive model of communication quality based on communication between the AP and the user terminal at one or more other user's homes that have the same or similar floor plan as the user's home in FIG. 10 . The communication control device 30 applies the generated prediction model to the user's home in FIG.

If the communication control device 30 predicts that the communication quality (radio wave environment) between the AP 26 and the user terminal 16 will deteriorate based on the environment information (for example, movement history within the home) of the user terminal 16 and the prediction model, the communication control device 30 changes the data of the user terminal 16. Increase redundancy. As an example of poor communication quality, if there are places in the user's home where the radio wave environment with the AP 26 is good and places where the radio wave environment is poor, the user may move to a place where the radio wave environment is poor (for example, a bathroom). Further, if it is predicted that the communication quality will improve from the environmental information (for example, movement history within the house) of the user terminal 16 (for example, when moving to the living room), the redundancy of the data of the user terminal 16 is lowered or returned to the initial value.

(Second embodiment)
In the second embodiment, a case will be described in which the base station (communication device) 20 is provided in a mobile body. The communication device 10 may be provided in a mobile object such as a user terminal, or may be fixedly installed.

FIG. 11 is a block diagram illustrating an example of a communication system according to the second embodiment. AP25 is provided in the elevator. A user is present in an elevator hall on the third floor of a building and is holding a user terminal 13. The AP 25 constitutes a wireless LAN and communicates with the user terminal 13 wirelessly. Further, the AP 25 is connected to a communication network 50 such as the Internet. The AP 25 has the same functions as the base station (communication device) 20 in FIG. 1, and further includes an environment information acquisition unit 104. The communication device 15 provided in the user terminal 13 has the same configuration as the communication device 10 in FIG. 1, but does not need to include the environment information acquisition unit 104.

The user terminal 13 can communicate with the server (receiving device) 40 on the communication network 50 using the AP 25 in the elevator as a relay device. The user terminal 13 can communicate with the communication control device 30 via the AP 25 or via another line.

When the elevator is located on or near the 3rd floor, the radio wave environment of the user terminal 13 is good, and high-quality communication (for example, communication with little packet loss) with the AP 25 is possible. On the other hand, if the elevator is far away from the 3rd floor, the radio wave environment of the user terminal 13 will deteriorate and communication quality will deteriorate (for example, packet loss etc. will increase).

The communication control device 30 generates a prediction model of communication quality based on communication between the AP 25 and a user terminal held by another user when the other user is present in the 3rd floor elevator hall. At this time, the environment information is acquired from the AP 25. An example of environmental information is the floor number where an elevator is located. The communication control device 30 assumes, for example, that the AP 25 located on the third floor is communicating with the user terminal 13 when predicting the communication quality. The communication control device 30 predicts that the communication quality between the AP 25 and the user terminal 13 will deteriorate (for example, when the elevator is predicted to move toward the 1st floor), and the communication control device 30 predicts that the communication quality between the AP 25 or the user terminal 13 will decrease. Increase the redundancy of data. Thereby, even if the elevator arrives at, for example, the 1st floor and the radio wave environment between the AP 25 and the user terminal 13 deteriorates, it is possible to prevent communication quality from deteriorating.

In this embodiment, the base station 25 is provided in an elevator, but the base station 25 may be provided in another moving object such as a flying object (drone, airplane, etc.), a car, or the like.

(Third embodiment)
Part or all of each device (the communication device 10, the communication device 20, the communication control device 30, or the receiving device 40) in the embodiments described above may be configured by hardware, or may be configured by a CPU (Central Processing Unit). , or information processing of software (program) executed by a GPU (Graphics Processing Unit) or the like. In the case where the software is configured by software information processing, the software that realizes at least some of the functions of each device in the above-described embodiments may be stored on a flexible disk, CD-ROM (Compact Disc-Read Only Memory), or USB (Universal Software information processing may be executed by storing the information in a non-temporary storage medium (non-temporary computer-readable medium) such as Serial Bus (Serial Bus) memory and reading it into a computer. Further, the software may be downloaded via a communication network. Furthermore, information processing may be performed by hardware by implementing software in a circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array).

The type of storage medium that stores software is not limited. The storage medium is not limited to a removable one such as a magnetic disk or an optical disk, but may be a fixed storage medium such as a hard disk or memory. Further, the storage medium may be provided inside the computer or may be provided outside the computer.

FIG. 12 is a block diagram showing an example of the hardware configuration of each device (communication device 10, communication device 20, communication control device 30, or receiving device 40) in the embodiment described above. Each device includes, for example, a processor 91, a main storage device 92 (memory), an auxiliary storage device 93 (memory), a network interface 94, and a device interface 95, which are connected via a bus 96. It may be realized as a computer 90.

Although the computer 90 in FIG. 12 includes one of each component, it may include a plurality of the same components. Furthermore, although one computer 90 is shown in FIG. 12, the software may be installed on multiple computers, and each of the multiple computers may execute the same or different part of the software. Good too. In this case, a form of distributed computing may be used in which each computer communicates via the network interface 94 or the like to execute processing. In other words, each device (the communication device 10, the communication device 20, the communication control device 30, or the receiving device 40) in the embodiment described above is capable of transmitting instructions stored in one or more storage devices to one or more computers. It may also be configured as a system that realizes functions by executing it. Alternatively, the information transmitted from the terminal may be processed by one or more computers provided on the cloud, and the processing results may be sent to the terminal.

Various calculations of each device (communication device 10, communication device 20, communication control device 30, or receiving device 40) in the embodiments described above are performed using one or more processors or by multiple computers via a network. It may also be executed in parallel using . Further, various calculations may be distributed to a plurality of calculation cores within the processor and executed in parallel. Further, a part or all of the processing, means, etc. of the present disclosure may be executed by at least one of a processor and a storage device provided on a cloud that can communicate with the computer 90 via a network. In this way, each device in the embodiments described above may be in the form of parallel computing using one or more computers.

The processor 91 may be an electronic circuit (processing circuit, processing circuitry, CPU, GPU, FPGA, ASIC, etc.) including a computer control device and an arithmetic device. Further, the processor 91 may be a semiconductor device or the like including a dedicated processing circuit. The processor 91 is not limited to an electronic circuit using an electronic logic element, but may be realized by an optical circuit using an optical logic element. Further, the processor 91 may include an arithmetic function based on quantum computing.

The processor 91 can perform arithmetic processing based on data and software (programs) input from each device in the internal configuration of the computer 90, and can output calculation results and control signals to each device. The processor 91 may control each component making up the computer 90 by executing the OS (Operating System) of the computer 90, applications, and the like.

Each device (the communication device 10, the communication device 20, the communication control device 30, or the receiving device 40) in the embodiment described above may be realized by one or more processors 91. Here, the processor 91 may refer to one or more electronic circuits arranged on one chip, or one or more electronic circuits arranged on two or more chips or two or more devices. You can also point. When using multiple electronic circuits, each electronic circuit may communicate by wire or wirelessly.

The main storage device 92 is a storage device that stores instructions and various data to be executed by the processor 91, and information stored in the main storage device 92 is read out by the processor 91. The auxiliary storage device 93 is a storage device other than the main storage device 92. Note that these storage devices are any electronic components capable of storing electronic information, and may be semiconductor memories. Semiconductor memory may be either volatile memory or nonvolatile memory. The storage device for storing various data in each device (communication device 10, communication device 20, communication control device 30, or receiving device 40) in the embodiments described above is realized by the main storage device 92 or the auxiliary storage device 93. It may also be realized by a built-in memory built into the processor 91. For example, the temporary storage units 140 and 240 in the embodiments described above may be realized by the main storage device 92 or the auxiliary storage device 93.

A plurality of processors may be connected (combined) to one storage device (memory), or a single processor may be connected to one storage device (memory). A plurality of storage devices (memories) may be connected (combined) to one processor. Each device (communication device 10, communication device 20, communication control device 30, or receiving device 40) in the embodiments described above is connected to (coupled with) at least one storage device (memory). ), at least one of the plurality of processors may be connected (coupled) to at least one storage device (memory). Further, this configuration may be realized by a storage device (memory) and a processor included in a plurality of computers. Furthermore, a configuration in which a storage device (memory) is integrated with a processor (for example, a cache memory including an L1 cache and an L2 cache) may be included.

The network interface 94 is an interface for connecting to the communication network 97 wirelessly or by wire. As the network interface 94, an appropriate interface such as one that complies with existing communication standards may be used. The network interface 94 may exchange information with an external device 98A connected via the communication network 97. Note that the communication network 97 may be any one of a WAN (Wide Area Network), a LAN (Local Area Network), a PAN (Personal Area Network), etc., or a combination thereof, and can be used to connect the computer 90 and the external device 98A. It is sufficient that information is exchanged between them. Examples of WAN include the Internet, examples of LAN include IEEE802.11 and Ethernet (registered trademark), and examples of PAN include Bluetooth (registered trademark) and NFC (Near Field Communication).

The device interface 95 is an interface such as a USB that is directly connected to the external device 98B.

The external device 98A is a device connected to the computer 90 via a network. External device 98B is a device directly connected to computer 90.

The external device 98A or the external device 98B may be an input device, for example. The input device is, for example, a device such as a camera, microphone, motion capture, various sensors, keyboard, mouse, or touch panel, and provides the acquired information to the computer 90. Alternatively, the device may be a device including an input section, a memory, and a processor, such as a personal computer, a tablet terminal, or a smartphone.

Further, the external device 98A or the external device 98B may be an output device, for example. The output device may be a display device such as an LCD (Liquid Crystal Display), a CRT (Cathode Ray Tube), a PDP (Plasma Display Panel), or an organic EL (Electro Luminescence) panel, or output audio or the like. It may also be a speaker or the like. Alternatively, the device may be a device including an output unit, a memory, and a processor, such as a personal computer, a tablet terminal, or a smartphone.

Further, the external device 98A or the external device 98B may be a storage device (memory). For example, the external device 98A may be a network storage or the like, and the external device 98B may be a storage such as an HDD.

Further, the external device 98A or the external device 98B may be a device having some functions of the components of each device (the communication device 10, the communication device 20, the communication control device 30, or the receiving device 40) in the above-described embodiments. . That is, the computer 90 may transmit or receive part or all of the processing results of the external device 98A or 98B.

In this specification (including claims), the expression "at least one (one) of a, b, and c" or "at least one (one) of a, b, or c" (including similar expressions) When used, it includes any of a, b, c, a-b, a-c, b-c, or a-b-c. Further, each element may include multiple instances, such as a-a, a-b-b, a-a-b-b-c-c, etc. Furthermore, it also includes adding other elements other than the listed elements (a, b and c), such as having d as in a-b-c-d.

In this specification (including claims), when expressions such as "using data as input/based on data/in accordance with/according to" (including similar expressions) are used, unless otherwise specified, This includes cases where various data itself is used as input, and cases where various data subjected to some processing (for example, noise added, normalized, intermediate representation of various data, etc.) are used as input. In addition, if it is stated that a certain result is obtained "based on/according to/according to data", this includes cases where the result is obtained only based on the data, and other data other than the data, It may also include cases where the results are obtained under the influence of factors, conditions, and/or states. In addition, if it is stated that "data will be output", if there is no special notice, various data itself may be used as output, or data that has been processed in some way (for example, data with added noise, normal This also includes cases in which the output is digitized data, intermediate representations of various data, etc.).

In this specification (including the claims), when the terms "connected" and "coupled" are used, the terms "connected" and "coupled" refer to direct connection/coupling and indirect connection/coupling. , electrically connected/coupled, communicatively connected/coupled, functionally connected/coupled, physically connected/coupled, etc., without limitation. intended as a term. The term should be interpreted as appropriate depending on the context in which the term is used, but forms of connection/coupling that are not intentionally or naturally excluded are not included in the term. Should be construed in a limited manner.

In this specification (including the claims), when the expression "A configured to B" is used, it means that the physical structure of element A is capable of performing operation B. configuration, and includes a permanent or temporary setting/configuration of element A being configured/set to actually perform operation B. good. For example, if element A is a general-purpose processor, the processor has a hardware configuration that can execute operation B, and can perform operation B by setting a permanent or temporary program (instruction). It only needs to be configured to actually execute. In addition, if element A is a dedicated processor or a dedicated arithmetic circuit, the circuit structure of the processor is configured to actually execute operation B, regardless of whether control instructions and data are actually attached. It is sufficient if it has been implemented.

In this specification (including the claims), when terms meaning inclusion or possession (for example, "comprising/including" and "having", etc.) are used, the object of the term It is intended as an open-ended term, including the case of containing or possessing something other than the object indicated. If the object of a term meaning inclusion or possession is an expression that does not specify a quantity or suggests a singular number (an expression with a or an as an article), the expression shall be interpreted as not being limited to a specific number. It should be.

In this specification (including the claims), expressions such as "one or more" or "at least one" are used in some places, and quantities are specified in other places. Even if an expression is used that suggests no or singular (an expression with the article a or an), it is not intended that the latter expression means "one". In general, expressions that do not specify a quantity or imply a singular number (expressions with the article a or an) should be construed as not necessarily being limited to a particular number.

In this specification, if it is stated that a specific effect (advantage/result) can be obtained with respect to a specific configuration of a certain embodiment, unless there is a reason to the contrary, one or more other components having the configuration may be used. It should be understood that the same effect can also be obtained with the embodiment. However, it should be understood that the presence or absence of the said effect generally depends on various factors, conditions, and/or states, and that the said effect is not necessarily obtained by the said configuration. The effect is only obtained by the configuration described in the Examples when various factors, conditions, and/or states, etc. are satisfied, and in the claimed invention that specifies the configuration or a similar configuration. However, this effect is not necessarily obtained.

In this specification (including the claims), when terms such as "maximize" are used, it refers to finding a global maximum value, finding an approximate value of a global maximum value, or finding a local maximum value. and approximating the local maximum value, and should be interpreted as appropriate depending on the context in which the term is used. It also includes finding approximate values of these maximum values probabilistically or heuristically. Similarly, terms such as "minimize" are used to refer to finding a global minimum, finding an approximation to a global minimum, finding a local minimum, and finding a local minimum. It includes approximations of values and should be interpreted as appropriate depending on the context in which the term is used. It also includes finding approximate values of these minimum values probabilistically or heuristically. Similarly, terms such as "optimize" are used to refer to finding a global optimum, finding an approximation to a global optimum, finding a local optimum, and determining a local optimum. It includes approximations of values and should be interpreted as appropriate depending on the context in which the term is used. It also includes finding approximate values of these optimal values probabilistically or heuristically.

In this specification (including claims), when multiple pieces of hardware perform a predetermined process, each piece of hardware may cooperate to perform the predetermined process, or some of the hardware may perform the predetermined process. You may do all of the above. Further, some hardware may perform part of a predetermined process, and another piece of hardware may perform the rest of the predetermined process. In this specification (including claims), when expressions such as "one or more hardware performs the first process, and the one or more hardware performs the second process" are used , the hardware that performs the first processing and the hardware that performs the second processing may be the same or different. In other words, the hardware that performs the first processing and the hardware that performs the second processing may be included in the one or more pieces of hardware. Note that the hardware may include an electronic circuit, a device including an electronic circuit, or the like.

In this specification (including claims), when multiple storage devices (memories) store data, each storage device (memory) among the multiple storage devices (memories) stores only part of the data. It may be stored, or the entire data may be stored.

Although the embodiments of the present disclosure have been described in detail above, the present disclosure is not limited to the individual embodiments described above. Various additions, changes, substitutions, and partial deletions are possible without departing from the conceptual idea and spirit of the present invention derived from the content defined in the claims and equivalents thereof. For example, in all the embodiments described above, when numerical values or formulas are used in the explanation, they are shown as examples, and the invention is not limited to these. Further, the order of each operation in the embodiment is shown as an example, and the order is not limited to this.

10 communication device, 11 antenna, 12 sensor device, 13 user terminal, 15 communication device, 16 user terminal, 20 communication device (base station), 21 antenna, 25 base station, 26 access point (AP), 30 communication control device, 31 antenna, 40 receiving device, 40 server (receiving device), 50 communication network, 90 computer, 91 processor, 92 main storage device, 93 auxiliary storage device, 94 network interface, 95 device interface, 96 bus, 97 communication network, 98A External device, 98B External device, 101 Transmission buffer unit, 102 Redundancy unit, 103 Communication unit, 104 Environment information acquisition unit, 105 Communication unit, 140 Temporary storage unit, 201 Communication unit, 202 Relay determination unit, 203 Communication unit, 205 Reconfiguration unit, 206 Reception buffer unit, 207 Data processing unit, 208 Communication quality measurement unit, 209 Communication unit, 301 Information acquisition unit, 302 Prediction unit, 303 Redundancy control unit, 304 Communication unit, 305 Communication unit, 306 Model storage Department

Claims (16)

between the third communication device and the second communication device based on environment information of the first communication device, communication quality information between the first communication device and the second communication device, and environment information of the third communication device. a prediction unit that predicts communication quality;
a control unit that makes data transmitted from at least one of the third communication device or the second communication device redundant based on the predicted communication quality;
Communication control device equipped with a model generation unit that generates a predictive model of communication quality for environmental information based on environmental information of the first communication device and communication quality information between the first communication device and the second communication device;
The communication control device according to claim 1, wherein the prediction unit predicts the communication quality based on environmental information of the third communication device and the prediction model. The communication control device according to claim 1 , wherein the prediction unit predicts the communication quality in a second period after the first period from the environment information of the third communication device in the first period. The communication control device according to claim 1, wherein the control unit increases the redundancy of the data as the predicted communication quality is lower. The communication control device according to claim 4, wherein the control unit increases the redundancy of the data by increasing the number of times the data is repeatedly transmitted. The communication control device according to claim 4, wherein the control unit increases the redundancy of the data by reducing the coding rate of the data. The control unit adjusts the timing at which the third communication device or the first communication device transmits redundant data generated by encoding the data based on the predicted communication quality. communication control device. The communication control device according to any one of claims 1 to 7, wherein the control unit changes the transmission interval of the data. The communication control device according to any one of claims 1 to 8, wherein the control unit changes the number of transmission systems for the data. The communication control device according to any one of claims 1 to 9, wherein the first communication device is provided in a first moving body, and the third communication device is provided in a second moving body. The communication control device according to claim 10, wherein the second communication device is a base station. the first communication device and the third communication device are base stations;
The communication control device according to claim 10. The communication control device according to any one of claims 10 to 12, wherein the first mobile body and the second mobile body are vehicles. A mobile body comprising the communication control device according to any one of claims 1 to 13. A base station comprising the communication control device according to any one of claims 1 to 13. between the third communication device and the second communication device based on environment information of the first communication device, communication quality information between the first communication device and the second communication device, and environment information of the third communication device. Predict communication quality,
A communication control method, wherein data transmitted from at least one of the third communication device and the second communication device is made redundant based on the predicted communication quality.

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